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32 votes
32 votes
Hello, can you help me with a Standard deviation question, please?

User Lmcadory
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1 Answer

25 votes
25 votes

To now how many had a score under 66, we have to calculate the following probability


P(X<66)=P(Z<(66-81)/(5))=P(Z<-3)=0.0013

So the amount of people that had a score under 66 is


4502\cdot0.0013=5.86\approx6

So 6 people get a score under 66

User Jake Feasel
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2.1k points